Abstract
In order to characterize the effect of metabisulfite (MBS) on human nasal mucosa, in 10 healthy, non-atopic subjects and in six patients with atopic rhinitis, 50 mg/mL and 100 mg/mL solutions of MBS were sprayed into both nostrils. Clinical symptoms and Nasal Peak Flow (NPF) were recorded. Nasal lavages were performed before and after MBS challenges. MBS challenge induced similar burning/itching sensation in both groups, but rhinorrhea was significantly more intense (P < 0.02) in atopic patients. There was no nasal congestion and no change in NPF after the challenge. Only in atopic patients were nasal symptoms accompanied by a dose-dependent increase in the concentration of total protein and glandular protein lysozyme in nasal washes (P < 0.05). No statistically significant changes were seen in the absolute amount of plasma protein albumin and albumin to total protein ratio (Albumin %) in nasal secretions. This study demonstrates that MBS induces nasal symptoms both in healthy, non-atopic subjects and in patients with allergic rhinitis; but secretory glandular responses are detected only in patients with allergic rhinitis.
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